Cam grinding machine



April 27, 1937. I A SILVEN 2,078,462

CAM GRINDING MACHINE Filed March 27, 1935 5 Sheets-Sheet l April27,1937.

H. A. SILVEN CAM GRINDING MACHINE Filed March 27, 1935 5 Sheets-Sheet 2H/ITNESSES April 27, 1937.

H. A. SILVEN CAM GRINDING MACHINE Filed March 27, 1935 5 Sheets-Sheet 3April 27, 1937. H A s v N 2,078,462

CAM GRINDING MACHINE Filed March 27, 1955 5 Sheets-Sheet 4 WGgqxfiM: j

27, 1937. H. A. SILVEN CAM GRINDING MACHINE Filed March 27, 1935 5Sheets-Sheet 5 HER ERT AlkS/L VEN W/ TNES 6 E6 i atented Apr; 27,

UNITED STATES PATENT OFFICE 2,078,462 AM GRINDING MACHINE tion ofMassachusetts Application March 27, 1935, Serial No. 13,289

19 Claims.

This invention relates to grinding machines,

and more particularly to an improvement in cam grinding apparatus.

Heretofore, in the grinding of camshafts, it has ,5 been found necessaryto grind the cam while feeding the wheel into the work and then allowingthe grinding wheel to remain in operative engagement with the workduring a finish grinding or dyingout period in order that the cam may befinished to the required size. The die-out period, if the wheel isallowed toentirely grind out, requires considerable time and results inimpairing the eificiency of the grinding machine. Attempts have beenmade to eliminate the die-out period or to reduce it to a minimum, butsuch a grinding operation without a die-out cut results in a reentrantcurve being produced on the periphery of the cam due to the curvature ofthe wheel at the point where the wheel and the cam separate from r eachother after grinding. While the reentrant curve is, in many cases, notwholly detrimental to the action of the cam, it does, however, leave :adistinct mark on the cam and is of sufficient rconsequence to cause therejection of a camshaft at the automobile plants in mass production,since the cam must be finished, according to the automotivespecifications, to a surface having a predetermined contour and finish.

It has been found by experimentation that if 30 the cam being ground andthe grinding wheel can be separated when the nose of the cam is in con-.tact with the wheel, the reentrant curve produced 'will besubstantially eliminated. It has been the practice in manuallycontrolled machines to attempt to manually separate the cam from thewheel or vice versa when in the above-mentioned predetermined position,that is, when the high point or nose of the cam is in operative engage-:ment with the periphery of the grinding wheel. 40 Such a manualoperation, however, requires a highly skilled operator and necessitatesa loss of time in grinding cams due to the fact that the operator mustreduce the cam to the required size :and then separate the cam and thewheel when the cam is in the desired position.

It is the primary object of this invention to provide an automaticlifting device which serves to automatically separate the work beingground :from the grinding wheel when a predetermined 50 portion of thework periphery is in contact with the wheel.

' It is another object of this invention to provide an automatic noselifting device which serves to automatically separate the cam beingground v55 from the grinding wheel when a predetermined portion of thecam, such as the nose or the high point of the cam, is in contact withthe wheel.

It is a further object of this invention to provide an electro-hydraulicmechanism for automatically separating the cam and the grinding wheelwhen the nose of the cam is in operative engagement with the wheel.Other objects will be apparent from the foregoing disclosure.

One embodiment of this invention has been illustrated in the drawings,in which like reference numerals indicate like parts:

Fig. l is a fragmentary perspective view of a cam grinding machineembodying this invention;

Fig. 2 is a fragmentary end elevation, on an enlarged scale, of theimproved cam grinding machine having parts broken away and shown insection to more clearly show the operation of the mechanism; Y

Fig. 3 is a fragmentary end view, on an enlarged scale, of the noselifting control device;

Fig. 4 is a fragmentary sectional view, on an enlarged scale, takenapproximately on the line 4-4 of Fig. 2;

Fig. 5 is a fragmentary plan view partly in section, on a reduced scale,taken approximately on the line 5+5 of Fig. 4;

Fig. 6 is a fragmentary rear elevation of the nose lifting controlswitch and its operating parts;

Fig. 7 is a fragmentary top plan view of the parts shown in Fig. 6;

Fig. 8 is a vertical section through the rock bar actuating cylinder;and

Fig. 9 is a perspective view, on an enlarged scale, of the nose liftingcontrol switch and its operating parts.

Broadly, this invention comprises a machine for grinding successive camson an integral camshaft, such as are used in the modern automobile, inwhich the grinding wheel and the camshaft are moved transverselyrelative to each other to grind the cam blank to a predetermined sizeand contour and in which the grinding wheel and camshaft are movedlongitudinally relative to each other to position successive cams inoperative relation with the grinding wheel. This machine is providedwith an automatically actuated mechanism for separating the cam blankand grinding wheel only When a predetermined portion of the cam, namely,the nose or high point of the cam, is in operative contact with theperiphery of the grinding wheel when the cam has been ground to apredetermined shape andsize.

Grinding wheel feed A grinding machine embodying this invention has beenillustrated in the drawings, in which a base supports a transverselymovable wheel slide ll mounted on the V-way l2 and flat way (not shown).The wheel slide ll carries a rotatable grinding wheel l3. The grindingwheel slide ll may be moved transversely relative to the base It by anysuitable mechanism, such as a rotatable cross feed screw [5, which issupported in bearings (not shown) in the base. A half nut l5 dependingfrom wheel slide H engages the threaded portion of feed screw l5. Areduced projection ll of the feed screw [5 carries a gear 48 meshingwith a pinion l9 on a shaft which in turn supports a manually rotatablefeed wheel 2|. The feed wheel 2| is provided with an adjustable abutment22 arranged to enage a stop pawl 23 which is pivotally mounted by meansof a stud 24 on the base Ill. The feed wheel 2! is provided with theusual micrometer adjusting mechanism 25 which serves to adjust theabutment 22 relative to the feed wheel 2| so as to precisely adjust thestopping point of the infeeding movement of the grinding wheel to permitaccurately sizing the work piece being ground. This feed mechanism issubstantially the same as that shown in the prior U. S. Norton PatentNo. 762,838 dated June 14, 1904 and the U. S. patent to Trefethen et al.No. 1,783,755 dated November 2, 1930, to which reference may be had forfurther details of disclosure not shown in the present drawings.

Longitudinal table traverse A longitudinally movable table is slidablymounted on the usual fiat way 3| and V-way 32 and is arranged to bemoved longitudinally relative to base it. The table 30 may be traversedlongitudinally either manually or automatically, as desired, but for thesake of simplicity of illustration, a manual operable traverse mechanismhas been illustrated comprising a rack bar 33 depending from the underside of table 30. The rack bar 33 meshes with a gear 34 mounted on arotatable shaft 35 which is rotatably supported in the base Ill. Theouter end of the shaft 35 carries a manually operable traverse wheel 36which may be rotated in either direction to traverse table 30 relativeto base I0 and grinding wheel I 3.

Rock bar and master cams In order that a cam may be accurately ground toa predetermined contour, it is necessary to provide a secondarytransverse movement between the wheel and cam blank during the grindingoperation in order that the desired contour may be produced on the cam.This movement may be accomplished by imparting a relative transversemovement between the wheel and cam blank but for the sake of simplicityof illustration, the conventional type of cam grinding apparatus hasbeen illustrated, comprising a rock bar which is pivotally supported onthe table 55 by means of brackets 4! so that the bar 40 is free to rockabout its axis 42. The rock bar 40 carries at one end a headstockportion 43 which rotatably supports a master camshaft having a pluralityof master cams 44. The rock bar also supports a product camshaft 45,having a plurality of cams 46 formed integrally therewith, in axialalignment with master cams 44. The master cams and product shaft aresupported in the well-known manner employed in camshaft grindingmachines, such as, for example, as shown in the patent to Trefethen etal. No.

1,783,755 dated December 2, 1930. Since the mountings of the master camsand the product camshaft do not constitute an essential part of thepresent invention, only an indication of this support has been made inthe present case. For further details of mounting of these parts,reference may be had to the prior patent to Trefethen et al.

In order that a relative transverse movement may be provided to producethe predetermined contour on the cam 46 being ground, it is desirable torock the bar with a predetermined controlled movement so that thedesired relative motion may be produced between the grinding wheel andthe cam being ground to produce a predetermined contour on the cam. Amaster cam follower roller 48 is slidably keyed to and supported on arotatable shaft 49 which is journaled in brackets 50 and 5| on aheadstock frame 52 which is fixed to-the table 30.

The master camshaft may be driven by any suitable means, such as apulley 53 (Fig. 1) which is driven by a belt 54 from an overhead sourceof power or, if desired, a motor driven unit may be provided byreplacing the pulley 53 with an electric motor. The pulley 53 is mountedon the outer end of a shaft 55 which is journaled in a bracket 56fixedly mounted on table 30. The shaft 55 is connected by a flexible oruniversal joint 5? to rotate a shaft 58 which is in turn connected by aflexible or universal joint 59 with the master camshaft carrying themaster cams 44. By rotation of the pulley 53, a rotary motion istransmitted to the master cams 44 and also to the product camshaft 45which, due to the mounting and arrangement of the parts, serves to causea rocking of the rock bar 40 as the master cams 44 rotate to cause apredetermined transverse movement between the cam being ground and theoperative face of the grinding wheel so as to generate a predeterminedcontour on the cam.

Rock bar-pressure device In order that the master cams 44 may bemaintained in operative engagement with the follower roller 48 duringthe normal grinding operation, a yieldable means is provided to exert apressure on the rock bar and maintain the master cams 44 in the desiredcontact with the roller 48. As illustrated in the drawings, a lever arm6! (Fig. 2) is rigidly fixed to rock bar 40. A connecting rod 62 ispivotally connected by a stud 63 on lever B I. The upper end of rod 63is provided with a collar 64 which is freely slidable within a cylindercasing 55 which is supported on headstock frame 52 by means of a bracket66. A spring 61 surrounds the rod 62 and is contained within thecylinder 65. The spring 6'! is interposed between the movable collar 64and a collar 68 which is fixed to the lower end of cylinder 65 so thatthe compression of spring 67 tends to move the arm 6! and rock bar 40 ina counterclockwise direction, as viewed in Figsrl and 2, so as tomaintain the master earns 44 in operative engagement with the master camroller 48 during the normal grinding operation.

Rock bar-automatic separation It is desirable to provide a suitableautomatically actuated mechanism to rock the bar 45 in a clockwisedirection so as to separate the master cams 44 from the roller 48 andalso to separate the cams 45 from the grinding wheel I3. This ispreferably accomplished by a fluid pressure operated mechanism, such asthat shown in the prior patent to Trefethen, et al. No. 1,783,755 datedDecember 2, 1930, to which reference may be had for details ofdisclosure not found in the present application. The fluid pressuremechanism may comprise a pump HI (Fig. 1) within the base II] which isadapted to draw fluid from a reservoir (not shown) through a pipe II, apipe 12 and a pipe 13 to a control valve 14. A rack bar I5, formed onthe projecting end of the stem of control valve I4 and meshing with agear '88 on a shaft 11, is operatively connected through a lost motionfriction device I8 with a gear i9 which meshes with the feed screw gearI8 so that when the feed wheel 2| is turned to cause a reverse orrearward feed of the wheel, the gearing and friction device cause therack 15 to move toward the ,"right, as viewed in Fig. 1, shifting valvepistons 80 and BI also toward the right so as to allow fluid underpressure to pass from pipe I3 through a valve chamber 98 into a pipe 82.The pipe 82 is in turn operatively connected to a control valve 83 whichis mounted on the side of a fluid pressure cylinder 84. The cylinder 84is supported on the headstock bracket 52. A piston 85 is slidablymounted within the cylinder 84 and serves to move a piston rod 86 whichbuts against the outer end of the lever BI. When fluid under pressure isadmitted through pipe 82, valve 83, it passes through a passage 81 intoa cylinder chamber 88 to cause a downward movement of piston 85, rod 86,so as to rock the lever 6! and rock bar 40 in a clockwise direction toseparate the master cams 44 from the roller 48 and the camshaft 45 fromthe grinding wheel I3. The valve pistons and ports of valve 83 are soarranged that in any position of valve 83, there is a free passage forfluid between the pipe 82, passage 81 and cylinder chamber 88. When thegrinding operation is started, the rotation of feed wheel 2I, to causean infeed, serves to shift valve 14 towards the left so that the pistons80 and 8I are in the full line position (Fig. 1). This movement servesto out 01f fluid pressure and opens a passage 89 to allow fluid toexhaust from the cylinder chamber 88 through passage 81, valve 83, apipe 82, a passage 89, through valve chamber 90 and out through a pipe9| into the reservoir, thus allowing free exhaust of fluid. Theclockwise rocking of the bar 48 and lever 6| into an inoperativeposition is limited by an adjustable stop screw 93 carried by a bracket94 which is fixed to the headstock frame 52. The above describedmechanism serves to rock the bar 40 to an inoperative position when thewheel feed is operated to cause a rearward movement of the grindingwheel and also to return the rock bar 40 to an operative position whenthe wheel feed mechanism is rotated to cause an infeeding of thegrinding wheel.

Nose lifting device In order to attain the main object of thisinvention, it is desirable to provide a mechanism, such as ishereinafter termed a nose-lifting device, for automatically separatingthe product earns 46 from the grinding wheel I3, only when the cam is ina predetermined rotative position, such as when the nose or high pointof the cam is in operative contact with the wheel. To accomplish thisresult, a mechanism is provided which is preferably operatedautomatically in timed relation with the rocking of the bar 40. While amaster cam 44 is rotating through one complete turn, the bar rockstoward and from the work once as controlled by the shape of the mastercam. By utilizing the rocking of the bar, it is possible toautomatically cause a separation of the master cam 44 and the followerroller 48 as well as the product cam 46 and the grinding wheel I3 whenthe high point of the master cam is in engagement with the surface ofthe master cam roller and the high point of the product cam 46 is inengagement with the grinding wheel.

The valve 83 is provided with a valve stem Ill and valve pistons H8, H9and I20. The valve 83 is preferably automatically actuated, such as bymeans of a solenoid I2I which is connected by 'a bell crank lever I22pivotally mounted on a stud I23 to move valve 83 in one direction, and aspring I24 is connected to move valve 83 in the opposite direction. Whenthe solenoid I2I is energized, the bell crank I22 is moved in acounterclockwise direction (Fig. to shift the valve stem II'I toward theright (Fig. 5). This movement serves to allow fluid under pressure frompump 18 to pass through a pipe 95 and the valve 83 through a passage 96into a cylinder chamber I25 to cause a downward movement of a piston I26so as to rock the lever 6| into position 6m and also to rock bar 40 in aclockwise direction to separate the product cam from the grinding wheel.The piston rod 86 is preferably formed in two parts which are looselyconnected by a telescopic connection I21 which permits independentoperation of pistons 85 and I26. The piston I26 is operated first bymeans of an electric control device hereinafter described to rock thelever 8| from the full line position (Fig. 2) into broken line positionGIa after the cam has been ground to a predetermined extent and when thenose or high point of the cam is in operative engagement with thegrinding Wheel. The piston 85, which is connected through rod 86, isactuated when the wheel feed is reversed to move the grinding wheel toan inoperative position and serves to cause a further downward movementof piston rod 86 to move lever 6| from the broken line position Gla intoposition BIZ) and to rock bar 48 into an inoperative position. When thebar 48 is in an inoperative position, the master cams and followerroller are sufficiently separated to permit indexing of the master camfollower roller relative to the master cams and indexing of the camshaftbeing ground relative to the operative face of the grinding wheel.

Nose lifting device-electric control In order that the valve may beactuated in the proper timed relation with the cam being ground, anelectrically operated device is provided to energize solenoid I2I when apredetermined portion of the master cam, namely, the high point or noseof the cam, is in operative contact with the grinding wheel. Such amechanism may comprise a mercury tube switch I30 which is secured inclips I3I on a rotatable plate I32. The plate I32 is preferably made ofan insulating material. The plate I32 is adjustably carried by a ratchetwheel I33 which is in turn mounted on the outer end of a rotatable studI34. The stud I34 is supported in an aperture I35 in a bracket I36 whichis fixed to the table 38. A sleeve I31 is fixedly connected with theratchet plate I33 and adapted to be rotated therewith.

A rotatable pawl carrying plate I38 is rotatably supported on a sleeveI31. The plate I38 carries a pawl E39 which is pivoted on a stud I40 andis arranged to be held in engagement with the teeth, of the ratchetwheel by means of a spring Mil interposed between the end of the pawlI39 and a portion of the plate I38. A projection I 42 of plate -38 isarranged in the pathof a lug I43 which is fixedly mounted to the rockbar 45 so that when the rock bar is rocked to carry the work piecetoward and from the grinding wheel to generate the predetermined contouron the cam blank, the lug Hi3 engaging the projection M2 rocks betweenfull line position (Fig. 3) and position i lia which serves to actuatethe pawl plate, 538 and the ratchet, pawl i353 to cause an intermittentrotary motion of the ratchet wheel 33. It will be readily apparent thatthe intermittent rotation of the ratchet wheel I33 in a counterclockwisedirection (Fig. 3) serves to tip the mercury switch I36, in acounterclockwise direction, through a sufficient distance so: that acolumn of mercury I44 joins with a column of mercury IMa, to close thecircuit between terminals I 41 and I 48. The closing of the circuitserves to energize the solenoid I2! and thereby shift the valve 33 toadmit fluid under pressure into cylinder chamber I25 to rock the bar 45in a clockwise direction so as to remove the cam from operativeengagement with the grinding wheel when a predetermined portion of thecam, namely, the nose or high point of the cam, is in operativeengagement with the wheel. A safety pawl I45 is pivotally mounted on astud I45 which is in turn supported on a non-rotatable plate I47. Thepawl I45 is maintained in operative engagement with the ratchet wheel533 by means of a spring N58. The plate it? is held stationary by a pinI49 so that the pawl I 35, therefore, serves as a safety pawl to preventthe ratchet wheel 5 33 from turning in a clockwise direction during itsnormal movement.

The ratchet plate 133 which supports the mercury switch ltil is providedwith. a projecting lug 255 which is connected by a spring I5! with astud Q52 and serves to exert a pressure tending to maintain the pawlplate its so that projection I42 remains in operative contact with lugI43 on rock bar 48.

During the grinding operation on a cam blank, the rock bar is oscillatedso that lug I43 moves between full line position (Fig. 3) and dottedline position I iSa. During this movement, the projection hi2 of thepawl carrying plate I38 is oscillated to move the pawl i39 over theteeth of ratchet wheel I33. This movement continues until the mercuryswitch I35 has rocked so that mercury M l contacts with mercury I A lato energize solenoid I2I. This serves to actuate valve 83 and cause afurther rocking movement of bar 48 to swing the rock bar to aninoperative position. Then, the feed wheel EI is rotated to move thegrinding wheel rearwardly. This movement of the feed wheel shifts valvei l and admits fluid pressure to cylinder chamber 88 to rock lever 6|from position {Ella to tlb. At the same time, the projection I 22 ofpawl carrying plate I38 is rocked into position M25. This movementserves to cause a pin 5175 of pawl I39 to ride up over a cam lid on afixed. plate I56 so as to withdraw the pawl 538 from engagement with theratchet teeth I133. The cam H5 is formed on plate I58 which is heldagainst rotation by a pin I 49 (Fig. 6). This same rocking movement ofthe projection Hi2 into position I421) alsoserves to cause a cam surfaceI78 formed on pawl carrying plate I33 to move and engage pin I on thesafety pawl I45 so as to rock the pawl I45 out of engagement with theratchet wheel !33.

As soon as the pawls I 39' and I45 have been withdrawn from engagementwith the teeth of the ratchet wheel I33, the released tension of aspring I85 interposed between a stud 86 on the pawl carrying plate I38and a stud I8? on the rock bar supporting bracket t! serves to rapidlymove the pawl carrying plate 338 in a clockwise direction so as toreturn it to its initial or starting position.

This return movement of the pawl carrying plate I38 is rapid, and it isdesirable to provide a suitable cushioning device to prevent shocks andvibrations when the plate reaches its normal position.

In the preferred construction, as illustrated in the drawings, a springpressed plunger I53 engages aprojecting portion H54 of the ratchet plateI33 and serves to prevent any shocks or vibrations as the plate is movedby the rock bar. In order to further cushion the motion of the springpressed plunger 253, the other end of the plunger 53 is arranged toserve as a dash pot piston I55 which is slidably mounted within a dashpot cylinder 55?. When the dash pot piston I56 moves toward the left, asviewed in Fig. 3, fluid within the dash pot piston is forced outwardlythrough a port I58 into a reservoir I59.

Nose lifting dcvice-operatice or inoperative In setting up the machineor for certain grinding operations, it is desirable that a control meansbe provided so that the nose lifting device may be readily renderedoperative or inoperative, as desired. As illustrated in the drawings, amanually operable lever W5 is pivotally mounted on a stud I 555 which isfixed to the headstock frame 52. The lower end of the lever is providedwith an arrow point i6? which is arranged to engage a spring-pressedroller I68 which serves to maintain the lever H65 in one of twopositions. In the position illustrated in Fig. l, the nose liftingdevice is operative. When it is desired to render the deviceinoperative, the lever N55- is manually moved in a clockwise direction(Fig. l) which serves to move the lower end of the lever toward theleft, as viewed in Fig. l. The lower end of the lever I85 is providedwith a pin I'Ill which engages a groove III in a spool I72 mounted onthe end of a rod I13 which is fixed to the non-rotatable plate 14?.Shifting the lever H65 in a clockwise direction (Fig. l) serves to causea movement of plate I 4?, the ratchet I33", pawls I39 and M5 togetherwith the mercury switch i3fi and its mounting plate Hi2 towards the leftuntil the projection of the pawl plate I38 is out of the path of thelug- M3 on rock bar Mil. When the projection 952 is moved out of thepath of the lug I45, the nose lifting device is rendered inoperative andthe machine may be operated manually or automatically without theoperation of the nose lifting device, if desired.

Automatic indexingmaster cam roller In order that successive cams on theshaft 45 may be accurately ground to the desired size and shape and inthe proper timed relation with the shaft 45, it is necessary to employ aplurality of master cams, one for each cam 66 on the product camshaft45. In grinding successive cams, it is necessary that the master camroller 48 be shifted longitudinally into operative relation with themaster cam corresponding with the product cam on the shaft 45 to beground. In the preferred construction, an. automatically operablemechanism, which is actuated in timed relation with the table traversemovement, so that when the work table 30 is traversed longitudinally toposition a product cam 46 in oper ative relation with the grinding wheelI3, the master cam roller 43 will likewise be automatically shiftedlongitudinally into operative relation with the corresponding master cam44, is provided. The mechanism illustrated in the present drawings isidentical with that shown in the prior patent to Trefethen, et al. No.1,783,755 dated December 2, 1930, to which ref-- erence. may be had fora complete disclosure, if desired.

-As illustrated in the drawings (Figs- 1 and 2), a slidably mounted yokeI09 is adapted to engage opposite sides of the master cam roller 48. Theyoke I00 is fixed to the end of a rack bar I0! which is arranged toslide longitudinally in a guiding member I02. A dog supporting bar I03is fixedly mounted by means of a bracket I84 to the base it. The bar5633 is provided with a plurality of adjustable dogs E05 which areadjustably arranged on the bar so as to correspond with the spacing ofearns 45 on the product shaft 45. A star wheel I05 is rotatablysupported on a bracket It! which in the present illustration is adepending portion of bracket 5|. The star wheel M36 is mounted on theend of a shaft IE8. The star wheel I06 is arranged in the path of thedogs Hi5 so that when the table 30 is traversed longitudinally,engagement of the dogs I85 serves to cause a partial rotation of thestar wheel Hit. The shaft 08 carries a gear I539 which in turn mesheswith a gear I I0 mounted on a stud Ill. The gear H0 in turn meshes witha pinion H2 mounted on a stud H3. The stud 5 I3 also carries a pinionII4 which is integral with pinion H2. It will be readily apparent fromthe illustration and description that when the table 30 is traversedlongitudinally to position the product camshaft .45, the dogs I05engaging the star wheel I06 cause an indexing movement of the master camroller 48 by means of the gear I09, gear IIO, pinion H2, pinion H4, rackIOI and yoke I00. It will be thus seen that when the table 30.is movedin either direction, the dogs serve to automatically index the roller 48longitudinally so that when any cam 46 on the camshaft 45 is broughtinto operative relation with the grinding wheel I3,v the master camroller 48 is located in proper relation with the corresponding mastercam 44.

While the present invention has been described as applied to a manuallyoperable cam grinding machine, I do not desire to be so limited ininterpreting the scope of the invention. My invention is equallyapplicable to an automatic cam grinding machine of the type shown in theU. S. Patents Nos. 1,840,088 and 1,945,588 and the copending applicationSerial No. 605,707.

The operation of this device will be readily apparent from the foregoingdisclosure. In setting up the machine, the stop abutment 22 of the feedmechanism is adjusted to properly size the cams 48. The dogs I05 areadjusted to index the master cam roller 44 in proper timed relation withthe cams 46 so that when the table traverses, the master cam roller 48is moved into operative relation with the master cam 44 correspondingwith the cam 46 to be ground. The plate I32, carrying the mercury switchI30, is then adjusted relative to the ratchet wheel I33 by means of anadjusting screw I 84 which is threaded into the ratchet plate I33 andpasses through an arcuate slot I83 in the plate I32. This arrangementpermits a fine adjustment of the mercury switch I30 so that the cambeing ground may be rotated and rocked a predetermined number ofrotations before the mercury switch becomes operative to energizesolenoid I2I and shift the valve 83 and admit fluid under pressure tocylinder chamber I25 to cause a separation of the master cam 44 andfollower 48 and corresponding separation of the product cam 35 andgrinding wheel is when any predetermined portion, such as the high pointor nose of the cam 46, is in engagement with the grinding wheelSuccessive cams may then be ground and the cam withdrawn from thegrinding wheel when the high or nose of the cam is in operativeengagement with the wheel.

-Having thus de -::ihed theinvention, what is claimed as new desired tosecure by Letters Patent is:

l. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other to successively grind a plurality of cams on anintegral camshaft, means to cause a relative transverse movement betweensaid wheel and work support to grind successive cams to a predeterminedsize, means to traverse said work support and wheel longitudinallyrelative to each other to position the wheel and cam blanks, means tocause a ated in timed relation with the rotation of the work supportautomatically to actuate said mechanism to separate the wheel and cambeing ground when a predetermined point of the cam is in engagement withthe wheel after a predetermined grinding operation has been completed.

2. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other to successively grind a plurality of cams on anintegral camshaft, means to cause a relative transverse movement betweensaid wheel and work support to grind successive cams to a predeterminedsize, means to traverse said work support and wheel longitudinallyrelative to each other toposition the wheel and cam blank, meansincluding a plurality of master cams and a follower to cause a relativetransverse movement between the wheel and work to grind successive camsto a pre" determined contour, mechanism to relatively move the grindingwheel and camshaft to an inoperative position and a nose lifting deviceactuated in timed relation with said transverse movement toautomatically control said mechanism and separate the wheel and cambeing ground when a predetermined point of the cam is in operativeengagement with the wheel after a predetermined grinding operation hasbeen completed.

3. A cam grinding machine having a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other, means to cause a transverse movement between thewheel and work support to grind successive cam blanks to a predeterminedsize and contour, means to cause a relative longitudinal movementbetween the wheel and work support to position successive cams inoperative relation with the grinding wheel, and electrically controlledmeans to cause a separating movement between the wheel and cam blankwhen the high point or nose of the cam is in operative contact with theperiphery of the grinding wheel after the cam blank has been ground to apredetermined size.

4. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other, means to cause a relative transverse movementbetween the wheel and work support to grind a cam blank to apredetermined size and contour, means to cause a relative longitudinalmovement between the wheel and work support to position successive camsin operative relation with the grinding wheel, and automaticallyactuated electrically controlled fluid pressure mechanism actuated intimed relation with the rotation of the work support to cause aseparating movement between the wheel and work support when the highpoint or nose of the cam is in a predetermined position relative to thegrinding wheel after the cam has been ground to a predetermined size andcontour.

5. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other to successively grind a plurality of cams on anintegral camshaft, means to cause a relative transverse movement betweenthe wheel and work support to grind successive cams to a predeterminedsize, means to traverse said work support and wheel longitudinallyrelative to each other to position the wheel and cam blank, meansincluding a plurality of master cams and a follower to cause a relativetransverse movement between the wheel and work to grind successive camsto a predetermined contour, and automatically actuated fluid pressuremechanism to separate the wheel and work support, and means actuated byand in timed relation with said transverse movement to controlsaid-fluid pressure mechanism so as to cause a separating movementbetween the wheel and work support when the high point or nose of themaster cam is in a predetermined rotary position relative to thegrinding wheel after the cam has been ground to a predetermined size andcontour.

6. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other to successively grind a plurality of cams on anintegral camshaft, means to cause a relative transverse movement betweenthe wheel and work support to grind successive cams to a predeterminedsize, means to traverse said work support and wheel longitudinallyrelative to each other to position the wheel and cam blanks, meansincluding a plurality of master cams and a follower to cause a relativetransverse movement between the wheel and work to grind successive camsto a predetermined contour, and electrically controlled means toautomatically separate the wheel and cam blank when the high point ornose of the cam is in operative engagement with the periphery of thewheel after the cam blank has been ground to a predetermined size andcontour.

7. A cam grinding machine having a rotatable grinding wheel and arotatable work support which are movable transversely and longitudinallyrelative to each other, means to cause a relative transverse movementbetween the wheel and Work support to grind a cam blank to apredetermined size and contour, means to relatively traverse said wheeland work support longitudinally to position successive cam blanks inoperative relation with the grinding wheel, separating mechanism toseparate the wheel and cam being ground, automatically actuated timingmechanism which is actuated in timed relation with the rotation of thework support to automatically separate the wheel and cam being groundwhen the cam is in a predetermined rotative position relative to thegrinding wheel after it has reached a predetermined size and contour,and means to render said last mentioned means inoperative when desired.

8. A cam grinding machine comprising a rotatable grinding wheel and arotatable work support which are movable longitudinally and transverselyrelative to each other to successively grind a plurality of cams on anintegral camshaft,

means to cause a relative transverse movement I between the wheel andwork support to grind successive cams to a predetermined size, means totraverse the work support and wheel longitudinally relative to eachother to position the wheel and cam blank, means including a pluralityof master cams and a follower to cause a predetermined transversemovement between the wheel and work to grind successive cams to apredetermined contour, separating means to separate the grinding wheeland cam being ground, automatically actuated timing mechanism which isactuated in timed relation with said transverse movement toautomatically actuate said separating means to separate the wheel andcam being ground when a predetermined point of the cam is in engagementwith the wheel after a predetermined grinding operation has beencompleted, and manually operable means to render said lifting deviceinoperative when desired.

9; A cam grinding machine comprising a rotatable grinding wheel and atable which are movable longitudinally and transversely relative to eachother to successively grind a plurality of cams on an integral camshaft,means to cause a relative transverse feeding movement between the wheeland work support to grind successive cams to a predetermined size, awork support pivotally mounted on said table, a rotatable camshaftsupport thereon, means including a plurality of master cams and afollower to rock said work support and cause a relative approaching andreceding movement between the grinding wheel and cam blanks to grind thecam blanks to a predetermined contour, means to rock said support to aninoperative position, and automatically actuated mechanism which servesto separate the cam being ground and the grinding wheel when the camblank is in a predetermined rotative position relative to the grindingwheel.

10. A cam grinding machine comprising a rotatable grinding wheel and atable which are movable longitudinally and transversely relative to eachother to successively grind a plurality of cams on an integral camshaft,means to cause a relative transverse feeding movement between the wheeland work support to grind successive cams to a predetermined size, awork support pivotally mounted on said table, a rotatable camshaftsupport thereon, means including a plurality of master cams and afollower to rock said work support and cause a relative aproaching andreceding movement between the grinding wheel and cam blanks to grind thecam blanks to a predetermined contour, means to rock said support to aninoperative position, and automatically actuated mechanism which serves"to separate the the cam being ground. and the grinding wheel when thehigh point or nose of the cam is in operative engagement with thegrinding wheel.

11. A cam grinding machine having a rotatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a work support pivotally mounted on said table andarranged to rotatably support a camshaft having a plurality of integralcams thereon, means to cause a transverse movement of the grinding wheelrelative to said support to grind successive cam blanks to apredetermined size, means to cause a relative longitudinal traversingmovement between the wheel and camshaft to position successive cams inoperative relation with the wheel, means including a plurality of mastercamsand a follower to cause a rocking movement of said work support togrind successive cams to predetermined contours, means including a fluidpressure cylinder operatively connected to rock said support to aninoperative position, and automatically actuated mechanism to separatethe grinding wheel and cam blanks when the high point or nose of the camis in operative contact with the grinding wheel.

12. A cam grinding machine comprising a rotatable grinding wheel atransversely movable slide to support said wheel, a longitudinallymovable table, and rotatable work support pivotally mounted on saidtable and arranged to rotatably support a camshaft having a plurality ofcams formed integrally therewith, means to cause a relative transversemovement of the grinding wheel slide to grind successive cams to apredetermined size, means to traverse said table longitudinally toposition successive cams in operative relation with said grinding wheel,means including a plurality of master cams and a follower operativelyarranged to cause a rocking movement of said support to grind successivecams to a predetermined contour, means including a fluid pressure pistonand cylinder operatively connected to rock said. support to aninoperative position, and electrically actuated means to control saidfluid pressure system so as to separate the cam being ground and thegrinding wheel only when the high point or nose of the cam is inoperative contact with the grinding wheel.

13. A cam grinding machine comprising a rotatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a rotatable work support pivotally mounted on said tableand arranged to rotatably support a camshaft having a plurality of camsformed integrally therewith, means to cause a relative transversemovement of the grinding wheel slide to grind successive cams to apredetermined size, means to traverse said table longitudinally toposition successive cams in operative relation with said grinding wheel,means including a plurality of master cams and a follower operativelyarranged to cause a rocking movement of said support to grind successivecams to a predetermined contour, means including a fluid pressure pistonand cylinder operatively connected to rock said support to aninoperative position, and electrically actuated means operated in timedrelation with the rocking of said support to control said fluid pressuresystem so as to separate the cam being ground and the grinding wheelonly when the high point or nose of the cam is in operative contact withthe grinding wheel.

14. A cam grinding machine comprising a retatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a pivotally mounted work support on said table arrangedto rotatably support a camshaft having a plurality of cams formedintegrally therewith, means to traverse said table longitudinally toposition successive cams in operative relation with the grinding wheel,means to cause a relative transverse movement between the grinding wheeland work support to grind successive cams to a predetermined size, meansincluding a plurality of master cams and a follower arranged to cause atransverse movement between the wheel and work support so as to grindsuccessive cams to a predetermined contour,means including a fluidpressure piston and cylinder operatively connected to rock said worksupport and separate the camshaft and the grinding wheel, a valvearranged to control the admission of fluid to said cylinder, andelectrically actuated means operated in timed relation with the rockingof said support to actuate said valve and cause a separation of the cambeing ground and the grinding wheel only when the nose of the cam beingground is in operative contact with the periphery of the grinding wheel.

15. A cam grinding machine comprising a rotatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a pivotally mounted Work support on said table arrangedto rotatably support a camshaft having a plurality of cams formedintegrally therewith, means to traverse said table longitudi nally toposition successive cams in operative relation with the grinding wheel,means to cause a relative transverse movement between the grinding wheeland work support to grind successive cams to a predetermined size, meansincluding a plurality of master cams and a follower arranged to cause atransverse movement between the wheel and work support so as to grindsuccessive cams to a predetermined contour, means including a fluidpressure piston and cylinder operatively connected to rock said worksupport and separate the camshaft and the grinding wheel, a valvearranged to control the admission of fluid to said cylinder, a solenoidoperatively connected to actuate said valve, and electrically actuatedmeans operated in timed relation with the rocking of said support toenergize said solenoid and actuate said valve to cause a separation ofthe cam being ground and the grinding wheel only when the nose or highpoint of the cam being ground is in operative contact with the peripheryof the grinding wheel.

16. A cam grinding machine comprising a rotatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a pivotally mounted work support on said table arrangedto rotatably support a camshaft having a plurality of cams formedintegrally therewith, means to traverse said table longitudinally toposition successive cams in operative relation with the grinding wheel,means to cause a relative transverse movement between the grinding wheeland the Work support to grind successive cams to a predetermined size,means including a plurality of master cams and a follower arranged tocause a transverse movement between the wheel and work support so as togrind successive cams to a predetermined contour, means including afluid pressure piston and cylinder operatively connected to rock saidwork support and separate the camshaft and the grinding wheel, a valvearranged to control the admission of fluid to said cylinder, a solenoidoperatively connected to actuate said valve, an electric switchoperatively connected with said solenoid, and means operated in timedrelation with the rocking of said sup-port to actuate said switch andcause a separation of thecam being ground and the grinding wheel onlywhen the nose of the cam being ground is in operative contact with the10 periphery of the wheel.

17. A cam grinding machine comprising a rotatable grinding wheel, atransversely movable slide to support said wheel, a longitudinallymovable table, a pivotally mounted work support on said table arrangedtorotatably support a camshaft having a plurality of cams formedintegrally therewith, means to traverse said table longitudinally toposition successive cams in operative relation with the grinding wheel,means to cause a 0 relative transverse movement between the grindingwheel and work support to grind successive cams to a predetermined size,means including a plurality of master cams and a follower arranged tocause a transverse movement between the wheel and work support so as togrind successive cams to a predetermined contour, means including afluid pressure piston and cylinder operatively connected to' rock saidwork support and separate the camshaft and the grinding Wheel, a valvear ranged to control the admission of fluid to said cylinder, a solenoidoperatively connected to actuate said valve, a mercury tube switchoperatively connected with said solenoid, a pivotally mounted supportfor said switch, and means operated in timed relation with the rockingof said support to intermittently rock said switch and cause aseparation of the cam being ground and the grinding wheel only when thenose of the cam being ground is in operative contact with the peripheryof the wheel.

'18. In a cam grinding machine having a pivotally mounted camshaftsupport and master cams and a follower to control the rocking movementof said support, a control device including an electric switch, meansincluding a pawl and ratchet mechanism to actuate said switch, meansactuated by the rocking movement of said camshaft support intermittentlyto index said ratchet wheel to actuate said switch, and an electricallycontrolled mechanism operated when the switch is actuated to cause aseparation of the master cam follower when the high point of the cambeing ground is in engagement with the wheel.

19. In a cam grinding machine having a pivotally mounted camshaftsupport and master cams and a follower to control the rocking movementof said support, a control device including an electric switch, meansincluding a pawl and ratchet to actuate said switch, connections betweensaid camshaft support and pawl to actuate the same in timed relationwith the rocking of said support, and an electrically. controlledmechanism operated by said switch to rock said support to an inoperativeposition after a predetermined grinding operation has been completed.

HERBERT A. SILVEN.

